Malicious Office (OOXML) / .XLSM — malware analysis report

Static analysis result for SHA-256 c177f507a8625a50…

MALICIOUS

Office (OOXML) / .XLSM

54.7 KB Created: 2021-04-18 22:18:27 UTC Authoring application: Microsoft Excel 16.0300
MD5: 37dddaca38ad99f97ee0855e6de00c17 SHA-1: 06e7b66fce297841f41f6956bdc1c061b8aca89e SHA-256: c177f507a8625a50fd3cbbe0cdd5f76947f9fb6a2872c0da80fcdf6a7a2ff31b
162 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.003 Windows Command Shell

This XLSM file contains VBA macros, indicated by the OOXML_VBA heuristic. The presence of Shell() and CreateObject calls within the VBA code suggests that the macro is designed to execute arbitrary commands on the system, likely to download and run a secondary payload. No document body text was available for analysis, and no external URLs were identified as malicious.

Heuristics 5

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • Suspicious extracted artifact high EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • VBA project inside OOXML medium OOXML_VBA
    Document contains vbaProject.bin — VBA macros present
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — context-specific rules above attribute URLs they actually evaluated; this rule lists URLs that were present in the bytes but were not otherwise tied to a specific finding.
    URL http://schemas.openxmlformats.org/spreadsheetml/2006/main
    • http://schemas.openxmlformats.org/officeDocument/2006/relationships
    • http://schemas.openxmlformats.org/markup-compatibility/2006
    • http://schemas.microsoft.com/office/spreadsheetml/2009/9/ac
    • http://schemas.microsoft.com/office/spreadsheetml/2014/revision
    • http://schemas.microsoft.com/office/spreadsheetml/2015/revision2
    • http://schemas.microsoft.com/office/spreadsheetml/2016/revision3

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
8494cf94d9dac565dac1a6beb19df0cfb6c7390a179efe8b7337c6cb1955a9ac		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 93288 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 shell/COM execution token(s). Carved artifact contains 9 Chr/ChrW string-construction calls.
vbaProject_00.bin
9e818e838266ee79edf8052482961c123ad2e4bbfc2b6643d939503a90296a5d		 vba-project OOXML VBA project: xl/vbaProject.bin 24576 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 shell/COM execution token(s).

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